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Question

Which of the following statements is not correct?
  1. All the oxides of halogens are powerful oxidants.
  2. The compounds of oxygen and fluorine are not called oxides but fluorides.
  3. Oxygen fluorides form oxoacids.
  4. In oxyhalides, bonds are mainly covalent due to small difference in electronegativity of oxygen and halogens.

A
All the oxides of halogens are powerful oxidants.
B
The compounds of oxygen and fluorine are not called oxides but fluorides.
C
Oxygen fluorides form oxoacids.
D
In oxyhalides, bonds are mainly covalent due to small difference in electronegativity of oxygen and halogens.
Solution
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Oxygen florides forms HF,O2 on hydrolysis.

OF2+H2OO2+2HF

2O2F2+2H2OO2+4HF

so oxygen florides do not form forms hypohalous acids.

So the given statement oxygen florides forms oxoacids is wrong.

Hence option C is correct.

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